IPfaces is a client-server framework for iPhone (and presumably other platforms soon) that enables developers to create a server-side app using their familiar tools then connect to a generic client that's already downloadable in the App Store. It's dual license, with a GPL Open Source version for free projects and a commercial version for for-profit apps. Unlike other frameworks that allow you to create an iPhone app using non Objective-C tools, this one gives you a real client, not just a wrapper for a web app.